CVE-2026-53212 (GCVE-0-2026-53212)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI
Title
netfilter: nft_tunnel: fix use-after-free on object destroy
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory. Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < 349df61526d2e39decc685d246202e3e284cfe05 (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < 55b79b1ae42372012413ce0413181d26679b17ef (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < 5e9ee18b27fde88cb6148202b33916c66693fe82 (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < 8767fe4079affa74314d7eb3220e700150289842 (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < fda6573a46ad24f35348e024905ee5bdf729797e (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < f9a0e4b61054cde89a2a77845293c726cc07cc43 (git)
Affected: af308b94a2a4a5a27bec9028354c4df444a7c8ba , < c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:13:58+00:00",
      "cve": "CVE-2026-53212",
      "id": "CVE-2026-53212",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nft_tunnel: fix use-after-free on object destroy",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53212.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.